Man pages matching name email::localdelivery::mbox in section 3pm:

Email::LocalDelivery::Mbox.3pm.en	debian 10 / libemail-localdelivery-perl
Email::LocalDelivery::Mbox.3pm.en	debian 11 / libemail-localdelivery-perl
Email::LocalDelivery::Mbox.3pm.en	debian 12 / libemail-localdelivery-perl